Examples with WritableResult org.apache.nifi.toolkit.cli.api.WritableResult used on opensource projects

Example 1 with WritableResult

use of org.apache.nifi.toolkit.cli.api.WritableResult in project nifi by apache.

the class CommandProcessor method processCommand.

// visible for testing
int processCommand(final String[] args, final Command command) throws ParseException {
    final CommandLine commandLine = parseCli(command, args);
    if (commandLine == null) {
        out.println("Unable to parse command line");
        return -1;
    }
    try {
        if (args.length == 1 && CommandOption.HELP.getLongName().equalsIgnoreCase(args[0])) {
            command.printUsage(null);
        } else {
            final Result result = command.execute(commandLine);
            if (result instanceof WritableResult) {
                final WritableResult writableResult = (WritableResult) result;
                writableResult.write(out);
            }
            // if the Result is Referenceable then create the resolver and store it in the holder for the next command
            if (result instanceof Referenceable) {
                final Referenceable referenceable = (Referenceable) result;
                final ReferenceResolver referenceResolver = referenceable.createReferenceResolver(context);
                // and can be used again if the current command didn't produce anything to resolve
                if (!referenceResolver.isEmpty()) {
                    backReferenceHolder.set(referenceResolver);
                }
            }
        }
        return 0;
    } catch (Exception e) {
        // so for those we don't need to print the usage every time
        if (e instanceof CommandException) {
            out.println();
            out.println("ERROR: " + e.getMessage());
            out.println();
        } else {
            command.printUsage(e.getMessage());
        }
        if (commandLine.hasOption(CommandOption.VERBOSE.getLongName())) {
            out.println();
            e.printStackTrace(out);
            out.println();
        }
        return -1;
    }
}